Multiple pump.



T. E. CHERRY.

MULTIPLE PUMP.

APPLIOATION FILED 11110.12, 1911.

Patented Feb. 11, 1913.

3 SHEETS-SHEET 1.

witnesses T..E. CHERRY.

MULTIPLE PUMP.

APPLICATION FILED D120. 12, 1911.

1,052,569. Patented Feb. 11, 1913.

3 SHEETSSHEBT 2,

Zia/1.67"?

3/ 30 a V Cljya T. B. CHERRY.

MULTIPLE PUMP.

APPLICATION FILED DBG.12, 1911.

3 SHEETS-SHEET 3.

lirzventor ZECher Patented Feb. 11, 1913.

THOMAS E. CHERRY, OF REVERE, MASSACHUSETTS.

MULTIPLE PUMP.

Specification of Letters Patent.

Application filed December 12, 1911.

Patented Feb. 11,1913. Serial No. 665,260.

-certain new and useful Improvements in Multiple Pumps, of which the following is a specification.

ThlS inventionrelates to pumps of the type which employ a plurality of cylinders and pistons, and refers particularly to pumps which have a casing which is provided with a circular series of parallel cylinders and with pistons in said cylinders and having means for successively actuating the pistons.

()ne of the objects of the present inven tionis to provide a simple, compact and powerful-pumpwhich willsupply a steady and continuous stream or circulation. Another object is to provide a pump of the character. described, having means for furnishing an equal delivery of fluids in opposite directions. y

A further object is to provide an improved construction which enables the pump to operate with a steady suction and wherein the resistance is steady and'practically uniform, the pressure of resistance being equal at bot-hends of the complete pump mechanism, thereby enabling. 'a balanced driving cam to be employed for operating the'pistons of the cylinders.

A further object of the invention is to provide a pump that is especially adapted for automobile fire engines, the pump being adapted to be operated by an internal combustionengine which is usually run at high speed.

A further object is to provide a structure of single plate carrying all of the valves, bot-h inlet and outlet valves, which plate may be readily removed and the valves with it, to facilitate examination and repairs.

To these ends the invention consists in the construction and combination of parts sub- 2 represents a longitudinal section substantially on line 22 of Fig. 1. Fig. 3 repre sents a section on line 3-3 of Fig. 2. Fig. 4 represents a section on line 44 of Fig. 2. Fig. 5 represents a front elevation of the pump a portion of the cam ring having the external gear teeth being broken out to illustrate the slots formed in the body or casing having the cylinders formed therein, said Fig. 5 also indicating a modification hereinafter referred to. Fig. 6 represents a section on line 66 of Fig, 2.

Similar reference characters indicate the same or similar parts in all of the views.

The casing comprises a body or central member 10, and end members 11, valve plates 12 being clamped between the inner faces of the members 11 and the ends of the body or central member as by means of suitable bolts 9. The body or central member 10 is formed with an internal chamber which at the ends communicates with openings 13 formed in the plates 12. Inalinement with the openings 13 are openings 14 formed in the outer walls of the end mem -bers 11. Running through the center of the Preferably the interior of the body 10 livery pipe 22 may be secured in place of said cap 20. It is to be understood, of course, that the pipe or pipes 22 will have means for coupling. thereto hoseor other conduits, especially if the pump is to be em ployed in a fire engine. Integral with or secured to the body 10 is an annular rib 23.

and in place between the. annular r bs by connecting bolts'or screws 28. The ring 26 is formed with gear .teeth 29 which mesh with, so as to be driven by, a inion 30 carried by a shaft 31 (Fig. 5) said shaft being a mounted in bearings formed or provided in standards 32. which latter have feet or base flanges '33 adapted to be secured to any suitin the pin 36.

able support. 7

Formed in the body 10 are cylinders 34, said cylinders being seven in number or more or less, and open atboth ends so as to com municate with chambers presently described The cylinders are arranged as a circular series and they are parallel with each other. Slidingly mounted in the cylinders 24 are double end pistons35, each piston having at substantially its mid-length, a pin 36 which projects radially as shown in Fig. 4 and has mountedthereon anti-friction roll 37, the rolls 37 entering the cam groove 27. Suitable means may be provided for preventing the pins froin rotating such as locking'pins 38, extending through'one' end of each 'pis'tonand entering a transverse hole Each pin 36 passes through a block 39 (Figs. 2 and 5) the'blockbeing fitted to a guide slot 40 formed in the outer wall of the portion of the body 10 radially from and parallel with the axis or'longitudinal center of the cylinder.

The body 10 as shown in Fig; 2 is somewhat enlarged at each end to provide chambe'rs 41 at the ends of the cylinders, s'aid cylinders being separated from each other by radial webs or partitions 42 (see Fig. 6). Each cylinder at its outer end communicates with or opens into an individual chamber 41.

Referring to Figs. 1 and 3, a suction pipe 43 communicates with a passage 44 in a casting 45 that is'boltedto the casing. Said a port 46, which in turn communicates with an annular suction chamber 47 in each of the end casing members 11, so that each an nular chamber 47 is supplied with the fluid that is to be drawn-into the pump and (l livered thereby.

The-plate 12'is'formed with two apertures for each chamber 41, and these two apertures are controlled by two valves, one

of which is the inlet valve and the other the outlet or discharge valve. The valves are alike and a description of one will suflice for all. The hole or aperture in theplate 12 receives a plug 48, which plug in turn has ports for the passage of fluid. Secured centrally in the plug is a fixed stem'or guide 49 on which is'slidably' mounted a valve 50, said valve being pressed to its seat on the end of the plug 28 by a spring 51 confined between said valve and a collar 52- that is secured on the projecting end of the stem or pin 49. The valve just described is an inlet valve and there is one of these valves for controlling the admission of fluid from suction chamber 47 to each one of the radial chambers 41. The outlet or discharge valves 54 similar in construction and mounting to the inlet valves control the discharge of fluid from the chamber 41 to the central chainber 53, one of such chambers 53 being provided in each of the end members 11 of the case.

In operation, the cam ring is rotated as by means of an internal combustion engine i driving the shaft 31 so that the pinion 30' of the latter will drive the cam ring. The walls of the internal groove of the cam ring act on the rolls 37 of the pins which project radially from the double-end .pistons so as to reciprocate the pistons of the series in succession around said series. Each end of each piston, by producing a partial vacuum in the chamber 41 causes the pressure of the. fluid in the chamber 47 ,to raise the valve 50 from its seatto admit fluid-into said-chamber 41. On the return of the piston, the valve 50 closes and'th'e valve 54'is raised from its seatso that the fluid is forced into the central or assembling disch'arge chamber 53. If. a pipe is coupled to each end of the multiple cylinder um instead ofemploying the cap 20 the, uid is forced, out in opposite directions. With the parts constructed asshown in Fig. 2, however, the fluid in the right hand chamber 53 escapes through the openings13-of the right hand valve plate 12 into the internal chamber of the body of the casing and through the loo openings 19 0f web 18.and then through the =openin 13 in the left hand valve plate 1'2 where it mingles or assembles. with the fluid that is being pumped by the left hand ends of the pistons, and finally will escape Ethrough the delivery pipe 22. passage 44 communicates at'each end with i The central chamber within the body 'member 10 provides. space for the forming and preservation of an air'cushion whether Since no ex- 1,052,059 i p Q operating brtdr'iv'ing devices. to be located outside of the enerally cylindrical form of the outside of e pump casing.

The pump .is exceedingly simple and powerful as well as compact, and is steady in operation both as regards the suction and discharge, thereby enabling it to be easily operated and driven by an internal combustion engine as described. The pressure of resistance to the operation of the cam is practically equal on both sides or ends of the comp ete multiple pump and therefore the actuating cam is balanced in operation whether the pump is employed to discharge through two separate lengths of hose in opposite directions or if the cap 20 is in place and the discharge or delivery is entirely through but one hose.

A particular feature of my invention is that one plate at each end of the double acting multiple pump carries all of the valves for that end, and this feature of advantage would appl equally as well to a pump, the cylinders 0 which act in but one direction. By removing an end member 11 the plate 12 clamped thereby may be removed if necessary, said plate carrying with it all of the valves so that they may be readily examined and cleaned or repaired.

It will be understood that if the transverse web 18 were continuous, there could be no mixing of fluids pum ed by the two ends of the mechanism. I then the passageway 44 were to lead to only one of the annular chambers 47, the other annular chamber being open to the atmosphere, the separate discharge, pipes shown 111 Fig. 5 could be utilized to convey two fluids being pumped. In other words the apparatus then could be used for simultaneously pumping liquid and gas such as water and air.

I claim 1. A pump comprising a casing having a circular series of parallel cylinders open at both ends, an internal cushioning chamber in communication with the delivery of all of the cylinders, double-end pistons in said cylinders, and external operating means for successively actuating said pistons.

2. A pump' comprising a casing having a circular series of parallel cylinders open at both ends, an internal cushioning chamber in communication with the delivery of all of the cylinders, double-end pistons in said cylinders, external operating means for successively actuating said pistons, and a valve plate opposite the ends of each series of cylinders, each of said plates having an inlet valve and an outlet valve for each cylinder.

3 A pump com rising a casing having a circular series 0 parallel cylinders open -at both ends, an internal cushioning chamber in communication with the delivery of all of the cylinders, double-end pistons in said. cylinders, means whereby the fluid operated upon by the pump may be discharged in opposite directions from the casing.

4. A pump comprising abody having a circular series of parallel cylinders open at both. ends, double-end pistons in said cylinand external ders, means for-successively actuating said pistons, end casing members, and a central tie-rod extending through from one end casing member to the other. 1

body hav- 5. A pump comprisin a casi ing a circular series 0 aralle cylinders open at both ends, double-end pistons in said cylinders, means for successively actuating said pistons, end casing members, and a central tie-rod extending through from one end casing member to the other, valve carrying plates being clam ed between the end members and the en of the body member.

6. A pump comprising a casing having a circular series of parallel cylinders open at both ends, an internal cushioning chamber in communication with the delivery of all of the cylinders, double-end pistons in said cylinders, each of said pistons having a radial pin, and a ring having an internal cam groove receiving the pins of the cylinders.

7. A pump comprising a casing having a circular series of parallel cylinders open at both ends, double-end istons in said cylinders, each of said pistons having a radial pin, and a ring having an internal cam groove receiving the pinsof the cylinders, the said cam ring being externally toothed to be driven by a pinion.

8. A pump comprising a casing having a both ends, an internal cushioning chamber in communication with the delivery of all of the cylinders, double-end pistons in said cylinders, each of said pistons having a pin projecting radially from its mid-length, the cylinder pins having rolls on their outer ends, and a ring rotatable on the casing and having an internal cam groove engaging the pins of the pistons.

9. A pump comprising a casing having a circular series of parallel cylinders open at both ends, said casing having external annular ribs, a ring rotatively mounted between said ribs and having an internal groove, double-end istons in said cylinders, and a pin carried y each of said pistons and engaging the groove in the ring.

10. A pump comprising a casing having a circular series of parallel cylinders open at both ends, an internal cushioning chamber in communication with the delivery of all of the cylinders, double-end pistons in said cylinders, each of said pistons having a transverse aperture, a pin mounted in the aperture of each piston, means -for locking said pin in place, and a cam for engaging blook mounted in each slot and having a 1'.)

said pins. cylinder pin passing through it, and a cam 11. A pump 'comprisin a casing having for actuating the cylinder pins.

a circular series of paral e1 cylinders open In testimony whereof I have afiixed my at both ends, said casing having a longltusignature, in presence of two witnesses.

dinal slot communicating with each cylin- THOMAS E. CHERRY. der, double-end pistons in said cylinders, Witnesses: each of said pistons having a pin project- A. \V. HARRISON,

ing through a slot of the casing, a slide J. M. MURPHY. 

